Method of reducing and grading pulp



C. E. HAWKINS. METHOD OF REDUCING AND GRADING PULP.

APPLICATION FILED APR-27, I921.

Patented Dec. 5, 1922.

3 SHEETSSHEET X.

C. -E. HAWKINS.

METHOD OF RE DUCINQ AND GRADING PULP. APPLICATION FILED 'APR. 27. 1921.

1A3Z8QQ, v Patented Dec. 5, 1922.

3 SHEETSSHEET 2- c. E. HAWKINS.

, METHOD OF REDUCING AND GRADING PULP. APPLICATION FILED APR. 27. 1921.

Lgs'nam Patented Dec. 5,1922

v3 SHEETSSHEET 3- Patented Ellen. 5,

CHARLES E. HAWKINS, Q1? GENUINE-ATE, QEEQ.

METEZQD 0F REDUCING" AND GRADING- Application filed April 2?,

To all whom it may concern:

Be it known that l, CnAnLns E. HAWKINS, .a citizen of the United States, and residing at Cincinnati in the county of Hamilton and State of hi0, have invented a new and useful Improvement in Methods of Reducing and Grading Pulp, of which the following specification is a full disclosure.

This invention relates generally to the art of paper-making and particularly to the process of reducing or disintegrating paper pulp to a graded product in a. continuous operation.

The process, as herein described and shown, is made applicable to a type of pulp reducing machine, known as a hollander or beating engine, into which the raw stock 'ungraded pulp or half stufi, from any source or of any material, is operated upon for a finer reduction and grading preparatory to.

its transfer to the chests or to the bleaching tanks, to condition the pulp for subsequent use in the manufacture of paper or box boards.

In the methods now generally practiced, a beater tub is filled with raw stock ungraded ulp or half stock and the entire mass re need to a. proper degree of fineness and then dumped into a chest. Certain methods for continuously grading nip,

. however, are in um, such as a revo ving screen or ader, which is partially immersed-in e beater tub through which the reduced pulp passes, or the material is allowed to pass over a stationary screen for discharging from the tub. In these methods, thescreen readily clogs, reducing the capacity of the machine and causing interruption in the operation.

It is therefore an object of'the invention to provide a method of grading and continuously discharging t e graded pulp through a non-clogging, self-cleaning, revolving screen or gradin drum disposed adj acent to the beater (am-disintegrating roll, whereby the material as reduced is conveyed to and cast upon the non-clogging, revolving screen by the revolving beater or disintegrator for the immediate grading a'nddischarge from the tub.

Another object is to place the non-clogging revolving screen, composed of hinged bars or members, in close proximity or adj acent to the beater roll androtate the same in a direction opposite to the direction of: beater rotation, whereby the coarse material tending longitudinally rear. Serial in. estate.

and such as will not pass through the screen mesh will be carried forwardly by the screen in an advancing direction, to prevent an accumulation. between the beater roll and in screen, and to permit the conveyed material to be dropped from the descending side of the screen, either by gravity or action of the screen member.

Another object of the invention is to form a revolving screen of hingedly mounted bars or elements, independently swinging to a vertically suspended open position at the descending side and return revolution or half-cycle of the roll, for releasing any ad'- 78 ings and reference is made to said drawings,

in which:

Fig. 1 is a plan view of a hollander or beating machine, illustrating the application 80 of. my invention thereto.

Fig. 2 is a. side elevation, parts being broken away to disclose the inner structure and relations.

Fig. 3 is a longitudinal, vertical section on line-3, 3, Fig. 4, illustrating the structure of my grading, straining and self-cleaning drum.

Figs is a vertical, transverse section on line 4, 4, Fig. 3.

Figs. 5, 6 and '2 are respectively an elevation, plan, and reverse plan, of one of the screen fingers of my drum.

Fig. 8 is a section on limit, 8, Fig. 5.

Fig. 9 is a fragmentary View, simllar to Fig. 4, showing a modified form of screen ig. 10 is a plan view of the modified finger structure, shown in Fi 9.

Fig. 11 is an end view ot the same.

Referring to the drawings, 1. indicates the tank or vat of'the hollander, of .the usual form, with a central partition 2 exof the tub, termed a mid feather, dividing the interior of the tub to an oval course for continuously traversing the pulp mass. About midway of one of the course runs, the bottom extends upwardly to form a transverse wall 3, curved on one side, conforming to the curvature of the beater roll 5 and inclined. on the reverse side toward the vat bottom.

mounted upon said frame arranged to swing to peripheral position for providing a foraminous surface for the roll 'inone-half cycle of the roll and to a vertically suspended.

position in a second half cycle of the roll.

' 2. 'A -rotative pulp grading roll comprising a roll frame and finger member pivotally mountedupon said frame in a series longitudinal of the axis of the roll andabout the frame, capable of swinging to a 'roll tangent position for providing a foraminous pe-- ripheral roll surface at the upper half of the roll and to a vertically suspended position at the lower half of the roll.

3. A rotative pul grading roll compris ing a roll frame an finger members pivot ally mounted upon said frame in -a series longitudinal of the axis of the roll and about the frame, capable of swinging to a roll tangent position for providing a foraminous peripheral roll surface atvthe upper half of the roll and to a vertically suspended position at the lower half of the roll, and a conveyor means disposed longitudinally within said roll.

4. A rotative pulp grading roll comprising opposite end frames, a series of cross rods connecting intermediately with said end frames, and in spaced relation about said frames, a plurality of screen forming fingers pivotally mounted upon one cross rod and adapted to rest upon the next adjacentcross rod in one position and freely vertically tion. I

5. A rotative pulp grading roll comprising ;a rotative frame structure having a series of rodsextending longitudinal with the axis of said frame structure and in a spaced relation circumferentially, arms at one end pivotally mounted upon said rods and on each rod arranged in a series side by side, the opposite ends of the arms on one rod adapted to engage a next adjacent rod-in one position and swing to a vertically suspended second position.

6. A. rotative pulp gradin roll comprising a rotative frame structure having a series of rods extending longitudinal with the axis of said frame structure and in a spaced relation circumferentially, arms at one end pivotally mounted upon'said rods and on each rod arranged in a series side by side, the

opposite ends of the arms on one rod adapted tovengage a next adjacent rod in one osition and swing to a vertically suspende second position, a plate fixed to each arm spaced from the corresponding plate of the next adjacent arm on the same axis.

In witness whereof, I hereunto subscribe in name, as attested by the two'subscribing witnesses.

CHARLES EfI-IAWKINS. Witnesses 4 L. A. Bnox, J. C. JUmUs. 

